Transfer string into a translation file & add Ukrainian (uk_ua) translations

[SuperNeon4ik]

At the start I wanted to add Ukrainian translations, but noticed some strings were hard-coded in & some translation keys weren't even used, so I also decided to "fix it up a bit ™️ "

This PR:

• Uses unused, but localized strings like text.autoconfig.islandutils.category.music & text.autoconfig.islandutils.category.cosmetics, instead of hard-coded literals
• Adds new translation keys like islandutils.message.core.updateAvailable or islandutils.message.friends.thisLobby, that gives an ability to localize more than just the config screen.
• Adds Ukrainian (uk_ua) translations of the strings (including the ones I added)

Open to feedback! Thank you!

[AsoDesu]

hello, pls can you resolve your merge conflicts, because i don't think i can push to your main branch

(in future, please don't open pull requests against your main branch)

[SuperNeon4ik]

Done! Thank you for the advice!

[AsoDesu]

heya, sorry it's been a while lol

since there's been a ton of changes made to IslandUtils since this PR opening, could you resolve the new conflicts created from 1.7.0, then i'll be able to merge this and #149 in :P

[SuperNeon4ik]

hi! i'm done with catching up with 1.7.0.
could you, please, add a "text.autoconfig.islandutils.option.showFishingUpgradeIcon.@Tooltip translation for English, so I can translate it based on that. i haven't played mcci for a while, so it would be better if you added the string so I could base my translation on yours, so not to guess how the setting actually works.
after that the pr is ready to be merged

[thehamish555]

Just to comment on this, while working on backporting to 1.21, I added the tool tip with the string "Shows an upgrade icon next to upgradable Fishing Perks". If there needs to be consistency across versions once aso sets up a branch for me to do a PR to